"This five-ingredient blackberry pie can be made with store-bought crust or homemade...."
INGREDIENTS
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1 (9-inch) uncooked pastry crust, rolled to 15 inches
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5 cups blackberries
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2/3 cup plus 2 teaspoons sugar, divided
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3 tablespoons cornstarch
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3 tablespoons boysenberry (or other berry) jam, whisked to thin